What did you do today (2015)

[OuBallieParticipant @ouballie]

Dave,

Neighbour and I are putting our heads together to try and sort out a way to make it decidedly unpleasant for anyone else who tries or gets over the fence.

The solution must not be obvious, otherwise he/we will be in trouble if some ^%# so much as scratch themselves.

Climbing rose and/or bramble would do the trick, but he doesn't want to wait for them to grow.

One owner, on the other side of the path, has put purpose made sharp 'anti-climbing' spikes along the top of his fence, and a sign warning people.

What has this world come to when you cannot protect your property?

Metal acquired for the vice stand, plus enough 50mm sq bar to make 4x Dickson style QC tool holders.

Geoff – Looks as if the stand could be finished sooner rather than later

[martin perman 1Participant @martinperman1]

Rik,

There havent been any Vampires or Venoms at Cranfield for years that I know of, there is a TSR2 at IWM Duxford.

The Vampire you saw, from memory, is based at Bournemouth I think and the RAF had a Meteor and Vampire that they used to display.

I live four miles north of the Shuttleworth Collection.

Martin P

[JasonBModerator @jasonb]

Enough of this idle chatter and back to the workshop

For the 5cc aero engine I needed a "D" shaped hole in the prop driver as below. 7.8mm OD with the flat tangental to the M6 thread that holds the prop on. Seemed like a good job for a broach.

So I stuck a bit of 3/8" silver steel in the lathe and reduced the end to 6mm and then increased the dia in steps 0.100" long until I was at the 7.8mm dia. Over to the mill and cut a flat along its length. Also parted off a slice of 25mm ali with a 6mm hole down the middle. Put the two into the high precision press with a bit of tapping fluid.

Knocked the broach out and was quite happy with the result

A close up of the broach and the rings of swarf it cut

Bit more work and thats another part off the list

J

[David ColwillParticipant @davidcolwill19261]

The only airworthy TSR2 was used as a ground target to observe the effects of gunnery on a modern aircraft. There is one at R.A.F Cosford which is well worth a visit.

Regards David.

[Ian PParticipant @ianp]

Posted by JasonB on 20/05/2015 20:48:01:

Enough of this idle chatter and back to the workshop

For the 5cc aero engine I needed a "D" shaped hole in the prop driver as below. 7.8mm OD with the flat tangental to the M6 thread that holds the prop on. Seemed like a good job for a broach.

So I stuck a bit of 3/8" silver steel in the lathe and reduced the end to 6mm and then increased the dia in steps 0.100" long until I was at the 7.8mm dia. Over to the mill and cut a flat along its length. Also parted off a slice of 25mm ali with a 6mm hole down the middle. Put the two into the high precision press with a bit of tapping fluid.

Knocked the broach out and was quite happy with the result

A close up of the broach and the rings of swarf it cut

Bit more work and thats another part off the list

J

I'm impressed!

Thats pretty nifty work Jason, I will definitely put that in my cranial tooling techniques library.

Ian P

[EmgeeParticipant @emgee]

Nice job Jason, is the front knurled or machined for the prop grip ?

Emgee

[Raymond Sanderson 2Participant @raymondsanderson2]

Posted by Ian Phillips on 20/05/2015 14:47:04:

Posted by Raymond Sanderson 2 on 20/05/2015 12:49:16:

Posted by Ian Phillips on 18/05/2015 17:09:53:

Just trepanned (triphained?) two lumps of 6082. Larger one is 4" diameter and 49mm thick. Both of these are going to have a 65mm dia finished bore but rather than progressive drilling and boring the core away I reground a 2.5mm parting blade so now have two 55 diameter blanks for future use. Took about 30 minutes to do both.

Ian P

Ian thanks for this post, I have some Brass stock i wish to do this to minimise waste.

I have often done this sort of thing with woodturning, coring the centres so no to waste often well grained timber. I do use a finer less depth parting tool when doing it though.

I am surprised that the internal circumference allowed the tool you have used to cut as deep through as it has without causing some trouble even though you have a rake/undercut.

Raymond

The hidden side of the blade shown is ground away almost to a knife edge which creates a bit more clearance on the OD of the annular groove. In addition I alternately raise and lower the blade (easy with a Dickson toolpost) as well as moving the cutter axially to two positions to widen the groove. Its not a precision process and I am not particular about observing precise rake and clearance angles so the method works for me.

IanP

Thanks Ian

[JasonBModerator @jasonb]

Posted by Emgee on 20/05/2015 23:09:18:

Nice job Jason, is the front knurled or machined for the prop grip ?

Emgee

If you mount the push type knurling tool high enough the top wheel can be used to good effect and saves having to make a single wheel holder.

[CirclipParticipant @circlip]

Was the Meteor and Vampire replaced that bumped into each other at Mildenhall years ago? Was classed as "Vintage Pair" at the time.

 

Regards Ian.

Edited By Circlip on 21/05/2015 12:03:57

[Danny M2ZParticipant @dannym2z]

Here is an Aussie Venom that I photographed at the local airshow a few years ago. Pretty high-tech in it's day.

*Danny M *

[martin perman 1Participant @martinperman1]

Ian,

Now you have jogged my memory, I witnessed that accident as well, I dont think the RAF did replace them.

Martin P

[Anonymous]

I haven't bought anything for the workshop for at least, oh must be a couple of weeks. And that continues as the arbor press I picked up this morning was free:

All I have to do now is work out how to get it out of the car boot (probably ask a neighbour to help) and where to squeeze it into the workshop.

Andrew

[Clive HartlandParticipant @clivehartland94829]

A deterrent hedging is Pyrocantha, lovely long penetrating spikes and grows quite thick quickly. It is also nice to see and makes red berries for the birds in winter.

Clive

[NJHParticipant @njh]

Good grief Andrew !

I'm glad I don't live next door to you.

Norman

[martin perman 1Participant @martinperman1]

Norman,

I would be happy to have him as a neighbour, that way I could borrow his kit , my Brother and I live about ten miles apart and both have workshops and we both share equipment so we don't double up.

Martin P

[modeng2000Participant @modeng2000]

Posted by Clive Hartland on 21/05/2015 14:51:15:

A deterrent hedging is Pyrocantha, lovely long penetrating spikes and grows quite thick quickly. It is also nice to see and makes red berries for the birds in winter.

Clive

It is fine until you have to start pruning. The cut-offs make super anti cat treatment for those places they like to use!

[Johnboy25Participant @johnboy25]

Andrew….

"All I have to do now is work out how to get it out of the car boot (probably ask a neighbour to help) and where to squeeze it into the workshop".

It must be a small one then!  

John

[steve de24Participant @stevede2433577]

Jason,

thanks for describing how to broach a D shaped hole, I've wondered how they do that with prop drivers. Are the broach's cutting edges made from the intersection of radial and cylindrical surfaces or do you need to machine relief angles? Is the silver steel heat treated before use to cut aluminium?

Regards, Steve

[JAParticipant @ja]

The TSR2 left Cranfield along with the P1121 and many other interesting aircraft and engines many years ago (I guess over 30 years ago).

I remember standing under it being amazed at how small the bundles of "instant sunshine" it would have carried were.

JA

[martin perman 1Participant @martinperman1]

Its the TSR2 at Duxford http://www.thunder-and-lightnings.co.uk/tsr2/survivor.php?id=2

Martin P

[martin perman 1Participant @martinperman1]

P1121 fuselage is at RAF Cosford.

Martin P

[Flying FiferParticipant @flyingfifer]

Danny,

Your pics look very much like a Vampire T22 trainer than a Venom !

Bogs, My apprenticeship was 10 years before yours and I`ve worked on many different military aircraft & helicopter types & I can`t recall anything made from cast iron on any. Once rolled a Centaurus engine crankcase onto a bonfire that was interesting when it caught fire!

Alan

[martin perman 1Participant @martinperman1]

It is a T35 Vampire http://commons.wikimedia.org/wiki/File:DH-115_Vampire_T35_A79-617_%28VH-VAM%29.jpg

[Anonymous]

Posted by Johnboy25 on 21/05/2015 18:32:29:

Andrew….

"All I have to do now is work out how to get it out of the car boot (probably ask a neighbour to help) and where to squeeze it into the workshop".

It must be a small one then! Â

John

'Fraid so, the throat is only about 12" and I bet it doesn't weigh more than a couple of hundred pounds. That's the problem with a small workshop, you just can't get man size equipment in it.

Andrew

[BazyleParticipant @bazyle]

Visited Exeter 'Mens Shed' . No metalworking machines but they had some nice woodworking machines, all brand new Axminster kit. It is run as a theraputic support facility for older men rather than as a personal workshop extension like some sheds. Activity is refurbishing tools, making birdboxes and things for a bit of income but very dependent on sizable charity donations.

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